Manual No. 016-3001-015 Rev. C 263
Rate Cal
The product rate cal value is entered in gallons per acre [L/ha] for liquid application systems or in pounds per
acre [kg/ha] for granular applications.
Liquid Applications and Spray Nozzles
Enter the desired target volume per minute of liquid product for the application. Refer to Unit of Measure
Conversions section on page x or contact a local sprayer or chemical supply dealer for more assistance.
The spray nozzles may also need to be adjusted for the target application rate. The following information must
be known in order to determine the correct spray nozzles to use with a liquid applicator.
• Nominal Application Pressure_________ PSI [kpa]
• Target Application Rate_________ GPA [lit/ha]
• Target Speed_________ MPH [km/h]
• Nozzle Spacing_________ inches [cm]
From this information, calculate the volume per minute per nozzle as follows:
where NVPM = Nozzle Volume per Minute (in gallons/acre [L/ha]), Rate = Target Application Rate, Speed =
Target Speed of Application and NS = Nozzle Spacing.
For Example:
Application Pressure = 30 PSI, Target Application Rate = 20 GPA, Target Speed = 5.2 MPH and Nozzle
Spacing = 20 inches
Using the calculated Nozzle Volume per Minute of 0.35 at an Application Pressure of 30, select a tip that is
capable of these application specifications. Contact a local sprayer supply dealer for available nozzles or
spray tips.
Band Spraying Rate Adjustment
To calculate the adjusted applied rate for band spraying applications, use the following formula:
where BR = the Broadcast Rate, BW = the bandwidth, S = the spacing between the tips, and AR = the
Adjusted Rate for band spraying.
For Example:
If the Broadcast Rate is 20 GPA [187 L/ha], the band width is 14 inches [35 cm], and the tip spacing is 40
inches [101 cm]:
Therefore, the adjusted rate is 7 GPA [65 L/ha].
NVPM
Rate Speed× NS×
5 940 60 000,[],
-----------------------------------------------
=
NVPM
20 5.2× 20×
5 940,
------------------------------- -
0.35==
BR BW×
S
---------------------- -
AR=
AR
20 187[]14 35[]×
40 101[]
-------------------------------------------
765[]==
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